JP2022144184A - Symbol reading device and program - Google Patents

Abstract

To provide a symbol reading device and program capable of efficiently reading a symbol represented on a paper medium and a display screen.SOLUTION: According to an embodiment, a symbol reading device includes: an imaging part; an illumination part capable of illuminating an imaging area of the imaging part; a detection part for detecting whether an object to be an imaging object is a non-light-emitting medium or a light-emitting medium on the basis of an image captured by the imaging part; an illumination control part for controlling operation of the illumination part in accordance with a detection result of the detection part; and a reading part for reading a symbol from the image captured by the imaging part.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD Embodiments of the present invention relate to a symbol reading device and a program.

2. Description of the Related Art Conventionally, there are symbol reading devices that read barcodes, two-dimensional codes (symbols) printed on paper media, and symbols displayed on display screens of mobile terminals and the like. In order to read the symbols printed on the paper medium, such a symbol reading device is irradiated with light from the outside.

On the other hand, when reading a symbol displayed on the display screen of a mobile terminal or the like, the display screen itself emits light. Symbol reading may become impossible.

Therefore, in order to be able to read both the symbols displayed on the paper medium and the display screen, the camera is designed so that the imaging timing of the camera and the lighting timing of the lighting are synchronized and asynchronous at regular intervals. and lighting have been proposed.

However, in the conventional technology, for example, when reading a symbol displayed on a display screen, there is a possibility that the symbol cannot be successfully read unless the camera imaging timing and lighting timing become asynchronous. Therefore, there is room for improvement in terms of symbol reading efficiency.

A problem to be solved by the present invention is to provide a symbol reading device and a program capable of efficiently reading symbols displayed on a paper medium and a display screen.

The symbol reading device of the embodiment comprises an imaging unit, an illumination unit capable of illuminating an imaging area of the imaging unit, and an object to be imaged based on the image captured by the imaging unit is a non-luminous medium. a light emitting medium, a lighting control unit for controlling the operation of the illumination unit according to the detection result of the detection unit, and a reading for reading a symbol from an image captured by the imaging unit. and

FIG. 1 is a perspective view showing the overall configuration of a POS system according to an embodiment. FIG. 2 is a diagram for explaining an example of the configuration of the reading device according to the embodiment; FIG. 3 is a diagram illustrating an example of a hardware configuration of a reading device according to the embodiment; FIG. 4 is a diagram illustrating an example of the functional configuration of the reading device according to the embodiment; FIG. 5 is an explanatory diagram illustrating an example of object detection processing according to the embodiment. FIG. 6 is a diagram illustrating an example of processing of the reading device.

The symbol reading device and program according to this embodiment will be described below. In the following embodiment, an example of application to a POS (Point Of Sales) system installed in a retail store will be described, but the present invention is not limited to this embodiment.

(Overall configuration of POS system)
FIG. 1 is a perspective view showing the overall configuration of a POS system 1. FIG. A POS (Point Of Sales) system 1 includes a reader 10 and a POS terminal 20 that executes data processing based on data read by the reader 10 . The reader 10 is an example of a "symbol reader."

The reading device 10 is erected at a place (approximately in the center) where the operator and the customer approximately face each other on the soccer table 2 on which a shopping basket or the like containing products is placed. A POS terminal 20 is provided near one end of the soccer table 2 . The reader 10 and the POS terminal 20 are communicably connected by a transmission line (not shown). The reading device 10 and the POS terminal 20 constitute the POS system 1 .

The POS terminal 20 executes sales data processing including registration processing and settlement processing of products purchased by the customer based on data such as products read by the reading device 10 . The POS terminal 20 is installed on a drawer 30 that stores coins and banknotes so that they can be put in and taken out. The POS terminal 20 includes two displays 21 (211, 212) for an operator and a customer, an input device 22 including a keyboard and key keys, and a receipt printer 23.

(Configuration of reading device)
Next, the configuration of the reading device 10 will be described. FIG. 2 is a diagram for explaining an example of the configuration of the reading device 10. As shown in FIG. Here, FIG. 2 shows a state in which the reader 10 is viewed from the side where the imaging window 111 is provided (the operator's standing position side).

The reading device 10 includes a body portion 11, an imaging portion 12, an illumination portion 13, a first display portion 14, a keyboard 15, a second display portion 16, and the like.

The body portion 11 is formed in a substantially rectangular parallelepiped shape and stands on the soccer table 2 . The height of the main body 11 is preferably about the height of the operator's eyes on the soccer table 2, for example.

An imaging window 111 serving as an opening is provided on the side of the main body 11 where the operator stands. An imaging unit 12 and an illumination unit 13 are installed in the imaging window 111 . The operator holds the product brought by the shopper over the imaging window 111 to read (image) the product.

The imaging unit 12 has an imaging element such as a CCD (Charge Coupled Device) or a CMOS (Complementary MOS) and an imaging lens. The imaging lens forms an image of the imaging region on the imaging element. The imaging area refers to an area where an image is formed on the area of the imaging element from the imaging window 111 through the imaging lens.

The image capturing unit 12 captures an image of the outside of the main body unit 11 through the image capturing window 111 . For example, the imaging unit 12 optically images a bar code, two-dimensional code, or the like printed on a paper medium. Barcodes, two-dimensional codes, etc. are examples of “symbols”, and paper media are examples of non-luminous media. Hereinafter, bar codes, two-dimensional codes, and the like are also simply referred to as "symbols."

Also, for example, the imaging unit 12 optically captures the symbol displayed on the display screen of the mobile terminal or the like possessed by the customer. A display screen of a mobile terminal or the like is, for example, an LCD (Liquid Crystal Display), and the display content becomes visible when the display screen is illuminated by a light-emitting unit such as a backlight. That is, the display screen is an example of a luminous medium. The display screen may be an OLED (Organic Light Emitting Diode) display in which the display screen itself emits light.

Here, it is assumed that the symbol printed on the paper medium holds data such as the product identifier (product code) and price encoded in the symbol.

It is also assumed that the symbols displayed on the display screen hold, for example, data representing discounts, discount coupons, etc., in a state encoded in the symbols. When data representing a coupon or the like is read by the reading device 10, the POS terminal 20 executes processing such as a discount or discount based on the data.

The lighting section 13 has a light source. The light source of the illumination unit 13 is arranged, for example, around the imaging lens of the imaging unit 12 . The illumination unit 13 irradiates the imaging area of the imaging unit 12 with light by turning on the light source. Note that the light source is, for example, an LED, a cold cathode tube, a fluorescent lamp, or an incandescent lamp.

The first display unit 14 is a display device for an operator and is provided above the imaging window 111 . The first display unit 14 is a display device with a touch panel configured by a display device such as an LCD. The first display unit 14 displays the product names, prices, etc. of the registered products to the operator according to the sales registration processing by the POS terminal 20 .

The keyboard 15 is provided near (on the side of) the first display section 14 . The keyboard 15 has various keys for registering products that cannot be registered as symbols or object images. In addition, although FIG. 2 shows an example in which the first display unit 14 and the keyboard 15 are provided integrally, they may be provided separately.

The second display unit 16 is a display device with a touch panel configured by a display device such as an LCD. The second display unit 16 displays the product name, price, etc. of the product registered for the shopper according to the sales registration processing by the POS terminal 20 . In this embodiment, the holding member (not shown) holds the second display portion 16 on the side portion of the main body portion 11, but the present invention is not limited to this configuration.

(Hardware configuration of reader)
Next, the hardware configuration of the reading device 10 will be described. FIG. 3 is a diagram showing an example of the hardware configuration of the reading device 10. As shown in FIG. The reader 10 has a microcomputer 101 . The microcomputer 101 drives and controls each section of the reader 10 .

The microcomputer 101 includes a CPU 102 , a ROM 104 , a RAM 105 , an input/output controller 106 , a lighting drive circuit 107 , a display/keyboard controller 108 , a storage section 109 and a communication interface 110 . Each component is connected via a bus line 103 .

A CPU (Central Processing Unit) 102 centrally controls each part. A ROM (Read Only Memory) 104 preliminarily stores fixed information such as a control program. A RAM (Random Access Memory) 105 functions as a work area or the like by rewritably storing various data.

Therefore, the microcomputer 101 constitutes an information processing section that executes information processing. All or part of the RAM 105 is a non-volatile memory.

The input/output controller 106 is connected to the imaging unit 12 . The input/output controller 106 outputs an image (image data) captured by the imaging unit 12 to the microcomputer 101 . The input/output controller 106 also outputs control signals output from the microcomputer 101 to the imaging unit 12 .

The illumination drive circuit 107 is connected to the illumination section 13 . The lighting drive circuit 107 controls turning on/off of the light source of the lighting unit 13 under the control of the CPU 102 .

The display/keyboard controller 108 drives and controls the first display section 14 and the second display section 16 to display various images on the display device 21 . The display/keyboard controller 108 also outputs to the microcomputer 101 an operation signal associated with a touch operation on the first display section 14 and the second display section 16 and an operation signal from the keyboard 15 .

The storage unit 109 is a storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive). The storage unit 109 stores various programs and various data related to the operation of the reading device 10 . The communication interface 110 enables data communication with another device (POS terminal 20) via a connection line such as a LAN cable.

(Function of reading device)
Next, with reference to FIG. 4, the functional configuration of the reading device 10 will be described. FIG. 4 is a diagram showing an example of the functional configuration of the reading device 10. As shown in FIG. The reading device 10 includes an image acquisition unit 121, a detection unit 122, an illumination control unit 123, an imaging setting unit 124, an imaging control unit 125, and a decoding processing unit 126 as functional configurations.

More specifically, the reader 10 has the above functional configuration as a software configuration through cooperation between the CPU 102 and the programs stored in the storage unit 109 . Part or all of the above functional configuration may be realized by a hardware configuration such as the CPU 102 or a dedicated circuit.

The image acquisition section 121 acquires an image captured by the imaging section 12 . Specifically, when the image acquisition unit 121 is instructed to start a transaction by an operation through the keyboard 15 or the first display unit 14 or by a signal notified from the POS terminal 20, the image acquisition unit 121 acquires an image through the input/output controller 106. The acquisition of the image data captured by the unit 12 is started.

The image acquisition unit 121 also acquires image data (hereinafter also referred to as a detection image) for detecting whether the object is a paper medium or a display screen. The image acquisition unit 121 also acquires image data for reading symbols (hereinafter also referred to as reading image).

Specifically, the image acquisition unit 121 acquires image data including information about which imaging has been set as a reading image, and acquires other image data as a detection image. The information about the imaging setting completed will be described later.

In addition, the image acquiring unit 121 stops acquiring image data when an end of transaction is instructed by operating the keyboard 15 or the first display unit 14 or by a signal notified from the POS terminal 20 .

The detection unit 122 detects whether an object to be imaged by the imaging unit 12 is a paper medium or a display screen. For example, the detection unit 122 detects whether the object is a paper medium or a display screen based on the detection image acquired by the image acquisition unit 121 .

Specifically, the detection unit 122 detects the luminescence intensity that indicates the luminescence intensity of the object according to the brightness of a predetermined area of the detection image. This makes it possible to detect whether the object is a paper medium or a display screen. Note that the detection unit 122 may detect only whether the object is a paper medium or a display screen.

The object detection processing will be described in detail below with reference to FIG. FIG. 5 is an explanatory diagram showing an example of object detection processing. First, the image acquisition unit 121 acquires the detection image I captured by the imaging unit 12 . The detection unit 122 detects a pixel with the highest luminance value within a predetermined detection area E. FIG.

In this example, the detection area E is a certain area including the center of the detection image I. FIG. Although the detection area E can be set arbitrarily, it is preferable to set the detection area E so as to include the center of the detection image I because the object is often overshadowed in the vicinity of the center of the imaging window 111 in general.

The detection unit 122 detects the luminescence intensity of the object according to the luminance value of the pixel having the highest luminance value within the detection area E. FIG. When detecting whether the object is a paper medium or a display screen, for example, the detection unit 122 preliminarily determines a threshold for the light emission intensity, and detects that the object is a paper medium when the threshold is less than the threshold. , the object is detected to be the display screen.

Note that the detection unit 122 may detect the luminescence intensity of the object according to the average value of the luminance values of the pixels within the detection region E. FIG. Alternatively, the detection unit 122 may extract some of the pixels in the detection region E and detect the luminous intensity of the object according to the average value of the luminance values of the extracted pixels. In this case, the detection unit 122 extracts, for example, pixels in the detection region E whose luminance values are in the top 10%.

Returning to FIG. 4, the description is continued. The illumination control unit 123 controls the light irradiation operation (mode) of the illumination unit 13 according to the detection result of the detection unit 122 . For example, when the target is a paper medium, the illumination control unit 123 operates the illumination unit 13 in the first mode for irradiating the target with light. Further, when the object is a display screen, the illumination control unit 123 operates the illumination unit 13 in the second mode in which the amount of light emitted is reduced from that in the first mode.

In this embodiment, the lighting control unit 123 controls turning on/off of the light source of the lighting unit 13 via the lighting drive circuit 107 . Specifically, the illumination control unit 123 turns on the light source of the illumination unit 13 and performs control so that the object is illuminated with light when the user holds the object in front of the imaging window 111 . Thereby, the imaging unit 12 can image the object in the first mode in which the object is irradiated with light.

Further, the illumination control unit 123 turns off the light source of the illumination unit 13, and performs control so that the object is not irradiated with light when the user holds up the object in front of the imaging window 111. FIG. Thereby, the imaging unit 12 can image the object in the second mode in which the object is not irradiated with light.

Note that the lighting control unit 123 may perform control to adjust the intensity of the light with which the object is irradiated according to the light emission intensity detected by the detection unit 122 . In this case, the illumination control unit 123 performs control such that the intensity of the light with which the object is irradiated becomes weaker as the intensity of light emitted from the object becomes stronger.

Here, in the present embodiment, the first mode functions as a mode for reading symbols printed on a paper medium, and the second mode functions as a mode for reading symbols displayed on the display screen. do.

Further, the lighting control unit 123 controls the lighting unit 13 to be in the second mode when the decoding processing unit 126 (to be described later) finishes the decoding process. In other words, the imaging unit 12 captures the detection image in the second mode.

Note that the lighting control unit 123 may operate the lighting unit 13 in the first mode when the decoding processing unit 126 finishes the decoding process. However, as described above, when the display screen is imaged in the first mode, reflection of light may occur and luminance may not be detected correctly. After that, it is preferable to control the lighting section 13 to the second mode.

The imaging setting unit 124 changes the settings of the imaging unit 12 according to the luminescence intensity detected by the detection unit 122 . For example, the imaging setting unit 124 changes the gain of the imaging unit 12, which is one of the settings of the imaging unit 12, according to the light emission intensity detected by the detection unit 122. FIG. Also, the imaging setting unit 124 changes the shutter speed of the imaging unit 12 , which is one of the settings of the imaging unit 12 , according to the light emission intensity detected by the detection unit 122 .

Specifically, the imaging setting unit 124 sets the gain of the imaging unit 12 so that the gain of the imaging unit 12 decreases as the luminescence intensity of the object increases. In general, the sensitivity of imaging is increased (increased gain) in a scene with a small amount of light, and the sensitivity of imaging is decreased (reduced gain) in a scene with a large amount of light.

Therefore, by performing the processing as described above, it is possible to image the object by adjusting the gain so that the sensitivity is suitable for the luminescence intensity of the object.

Further, the imaging setting unit 124 sets the shutter speed of the imaging unit 12 so that the higher the luminescence intensity of the object, the faster the shutter speed of the imaging unit 12 . A faster shutter speed reduces the amount of light taken in during exposure, and a slower shutter speed increases the amount of light taken in. Therefore, generally, the shutter speed is slowed down in a scene with a small amount of light, and the shutter speed is increased in a scene with a large amount of light.

Therefore, by performing the above-described processing, it is possible to capture an image of the object by adjusting the shutter speed so that the amount of light at the time of imaging is suitable for the luminous intensity of the object.

Note that the image capturing setting unit 124 may only perform processing for setting the gain of the image capturing unit 12 so that the gain of the image capturing unit 12 decreases as the luminescence intensity of the object increases. Alternatively, the imaging setting unit 124 may perform only processing for setting the shutter speed of the imaging unit 12 so that the shutter speed of the imaging unit 12 increases as the luminescence intensity of the object increases.

Further, when the decoding processing unit 126, which will be described later, finishes the decoding process, the imaging setting unit 124 changes the settings of the imaging unit 12 to predetermined basic settings. In other words, the imaging unit 12 captures the detection image according to the basic settings.

The basic settings can be set freely, but if the illumination unit 13 is in the second mode, there is a possibility that the exposure will be insufficient when capturing an image of a paper medium. Late is preferred.

The imaging control unit 125 controls the imaging unit 12 to capture an image of the object. The imaging control unit 125 changes the settings of the imaging unit 12 according to the intensity of light emitted by the detection unit 122, for example, and performs control for imaging the object.

Specifically, before the imaging setting unit 124 sets the imaging unit 12, the imaging control unit 125 controls the imaging unit 12 according to the basic settings and images the object. After the imaging setting unit 124 sets the imaging unit 12, the imaging control unit 125 controls the imaging unit 12 according to the settings of the imaging unit 12 set by the imaging setting unit 124, and images the object.

In addition, the imaging control unit 125 controls the image data captured by the imaging unit 12 until the decoding processing unit 126 ends decoding processing after the imaging setting unit 124 sets the imaging unit 12. is added with information indicating that the image capturing setting has been completed. This enables the image acquisition unit 121 to acquire the detection image and the reading image separately.

The decoding processing unit 126 extracts the information by decoding the encoded information. Specifically, the decoding processing unit 126 detects an area representing a symbol from the reading image acquired by the image acquiring unit 121, and executes processing for decoding encoded data held by the symbol.

Further, the decoding processing unit 126 outputs the data extracted by decoding the encoded data held by the symbols to the POS terminal 20 or the like.

(Reading device processing)
Next, processing of the reading device 10 will be described. FIG. 6 is a flow chart showing an example of processing of the reading device.

First, the imaging control unit 125 controls the imaging unit 12 according to the basic settings to capture an image for detection of an object (step S1).

Next, the image acquisition unit 121 acquires a detection image (step S2).

Next, the detector 122 detects the luminescence intensity of the object (step S3). Further, the detection unit 122 detects whether the object is a paper medium or a display screen.

Next, the lighting control section 123 controls the operation of the lighting section 13 according to the detection result of step S3 (step S4). Specifically, the lighting control unit 123 sets the lighting unit 13 to the first mode when the target is a paper medium, and sets the lighting unit 13 to the first mode when the target is a display screen of a mobile terminal or the like. Set to mode 2.

Next, the imaging setting unit 124 changes the settings of the imaging unit 12 according to the luminescence intensity of the object detected by the detection unit 122 (step S5). Specifically, the imaging setting unit 124 sets the gain such that the gain of the imaging unit 12 decreases as the luminescence intensity of the object increases. Also, the shutter speed is set so that the higher the luminescence intensity of the object, the faster the shutter speed.

Next, the image capturing control unit 125 controls the image capturing unit 12 according to the setting of the image capturing setting unit 124, and captures a reading image of the object (step S6).

Next, the image acquisition unit 121 acquires the image for reading (step S7).

Next, the decoding processing unit 126 executes symbol decoding processing based on the reading image acquired by the image acquisition unit 121 (step S8).

When the decoding process is completed, the illumination control section 123 controls the illumination section 13 to the second mode (step S9).

Next, the imaging setting unit 124 changes the settings of the imaging unit 12 to basic settings (step S10).

Next, the decoding processing unit 126 outputs the decoded data to the POS terminal 20 (step S11).

Next, the imaging control unit 125 determines whether or not to end the reading process (step S12). For example, the imaging control unit 125 determines to end the reading process when the end of the transaction is instructed by operating the keyboard 15 or the first display unit 14 or by a signal notified from the POS terminal 20 .

If it is determined not to end the reading process (step S12: No), the process proceeds to step S1. On the other hand, if it is determined to end the reading process (step S12: Yes), this process ends.

(Effect of reader)
The reading device 10 of the present embodiment detects whether the object is a paper medium or a display screen. When it is detected that the object is the display screen, the light irradiation by the illumination unit 13 is controlled so as to enter the second mode in which the object is not irradiated with light.

Thereby, the reading device 10 of the present embodiment can dynamically switch the light irradiation by the illumination unit 13 according to the detection result of whether the object is a paper medium or a display screen. Therefore, the reading device 10 of the present embodiment can quickly image a barcode or two-dimensional code printed on a paper medium or a barcode or two-dimensional code displayed on a display screen in a mode suitable for each. .

In other words, the reading device 10 of the present embodiment can efficiently read symbols whether they are symbols printed on a paper medium or symbols displayed on a display screen.

Further, the reading device 10 of the present embodiment detects whether the object is a paper medium or a display screen according to the brightness of a predetermined area of the image of the object captured by the imaging unit 12 . As a result, it is possible to detect whether the object is a paper medium or a display screen without adding hardware such as a camera for detection.

Further, the reading device 10 of the present embodiment detects the luminescence intensity of the object, changes the setting of the imaging unit 12 according to the detected luminescence intensity, and controls the imaging of the object. Accordingly, the object can be imaged with the gain and shutter speed of the imaging unit 12 corresponding to each state depending on the intensity of light on the display screen.

In addition, the reading device 10 of the present embodiment controls the image pickup by lowering the gain of the image pickup unit 12 as the light emission intensity of the object becomes stronger. As a result, when the display screen shines strongly, the sensitivity of the imaging unit 12 can be suppressed to capture an image, and when the display screen shines weakly, the sensitivity of the imaging unit 12 can be increased to capture the image. .

In addition, the reading device 10 of the present embodiment controls the shutter speed of the imaging unit 12 to be increased as the luminescence intensity of the object increases. As a result, when the display screen shines strongly, the amount of light taken in can be reduced, and when the display screen shines weakly, the amount of light taken in can be increased.

It should be noted that the above-described embodiment can be appropriately modified and implemented by changing a part of the configuration or functions of the reading device 10 . So, below, the modification which concerns on embodiment mentioned above is demonstrated as another embodiment.

In the following description, points different from the above-described embodiment will be mainly described, and detailed description of points common to the contents already described will be omitted. Further, the modifications described below may be implemented individually or in combination as appropriate.

(Modification)
In the embodiment described above, the detection unit 122 detects whether the object is a paper medium or a display screen according to the brightness of a predetermined area of the image of the object captured by the imaging unit 12. explained. However, the detection unit 122 may detect whether the object is a paper medium or a display screen based on the form of the object imaged by the imaging unit 12 .

In this modification, for example, the detection unit 122 analyzes the detection image acquired by the image acquisition unit 121 and recognizes an object in the detection image. When the shape feature of the object matches the predetermined shape feature of a mobile terminal or the like, the detection unit 122 detects that the target object is the display screen. On the other hand, if the morphological features of the object do not match the morphological features of the mobile terminal or the like, the detection unit 122 detects that the target is a paper medium.

According to this modification, it is possible to prevent a situation in which the luminance value of an image including an object due to light reflection is erroneously detected, and whether the object is a paper medium or a display screen is erroneously detected. can be done.

The program to be executed by the reading device 10 of the above-described embodiment is pre-installed in a storage medium (ROM 104 or storage unit 109) included in the reading device 10 and provided. It may be configured to record and provide a computer-readable recording medium such as a CD-ROM, a flexible disk (FD), a CD-R, a DVD (Digital Versatile Disk), or the like in a file of a possible format.

Note that the storage medium is not limited to a medium independent of a computer or an embedded system, but also includes a storage medium that stores or temporarily stores a downloaded program transmitted via a LAN, the Internet, or the like.

Alternatively, the program executed by the reader 10 of the above-described embodiment may be stored in a computer connected to a network such as the Internet, and may be provided by being downloaded via the network. Further, the program executed by the reading device 10 of the above embodiment may be configured to be provided or distributed via a network such as the Internet.

Although the embodiment of the present invention has been described above, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be embodied in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the scope of the invention described in the claims and its equivalents.

1 POS system 2 soccer table 10 reading device 11 main unit 12 imaging unit 13 illumination unit 14 first display unit 15 keyboard 16 second display unit 20 POS terminal 21 display device 22 input device 23 receipt printer 30 drawer 101 microcomputer 102 CPU
103 bus line 104 ROM
105 RAMs
106 input/output controller 107 illumination drive circuit 108 display/keyboard controller 109 storage unit 110 communication interface 121 image acquisition unit 122 detection unit 123 illumination control unit 124 imaging setting unit 125 imaging control unit 126 decoding processing unit

JP 2015-170035 A

Claims (6)

an imaging unit;
an illumination unit capable of illuminating an imaging area of the imaging unit;
a detection unit that detects whether an object to be imaged is a non-luminous medium or a luminous medium based on the image captured by the imaging unit;
a lighting control unit that controls the operation of the lighting unit according to the detection result of the detection unit;
a reading unit that reads a symbol from an image captured by the imaging unit;
a symbol reader. The illumination control unit operates the illumination unit in a first mode for irradiating the imaging area with light when the object is the non-luminous medium, and operates the illumination unit when the object is the luminous medium. 2. The symbol reading device according to claim 1, wherein said illumination section is operated in a second mode in which the quantity of said light is lower than that in said first mode. The detection unit detects whether the object is the non-luminous medium or the luminous medium according to the brightness of a predetermined area of the image of the object captured by the imaging unit.
3. A symbol reader according to claim 1 or 2. An imaging control unit that controls the imaging unit and images the object,
The detection unit further detects the luminescence intensity of the object,
The imaging control unit changes the settings of the imaging unit according to the luminescence intensity detected by the detection unit and performs control to image the object.
A symbol reading device according to any one of claims 1 to 3. The image pickup control unit controls the image pickup by reducing the gain of the image pickup unit as the setting as the light emission intensity becomes stronger, and the image pickup unit as the setting as the light emission intensity becomes higher. Perform at least one of the control of imaging by increasing the shutter speed of
5. A symbol reader according to claim 4. a computer of a symbol reading device comprising an imaging unit and an illumination unit capable of illuminating an imaging area of the imaging unit;
a detection unit that detects whether an object to be imaged is a non-luminous medium or a luminous medium based on the image captured by the imaging unit;
a lighting control unit that controls the operation of the lighting unit according to the detection result of the detection unit;
a reading unit that reads a symbol from an image captured by the imaging unit;
A program that acts as a

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